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      <title>如何确保RabbitMQ中的消息是持久化的？ - 交互式测验</title>
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            <div class="quiz-header">
              <h1>如何确保RabbitMQ中的消息是持久化的？ - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
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      <script>
        const quizData = [
  {
    "question": "在RabbitMQ中，为了确保一个队列（Queue）本身在服务器重启后不会消失，应该在声明它时如何配置？",
    "options": [
      "设置 deliveryMode 属性为 2",
      "将 durable 参数设置为 true",
      "将 autoDelete 参数设置为 false",
      "调用 channel.txSelect() 方法"
    ],
    "correctAnswerIndex": 1,
    "explanation": "队列的持久化是通过在声明队列时将 `durable` 参数设置为 `true` 来实现的。这会告诉RabbitMQ将队列的元数据保存到磁盘，从而在服务器重启后能够恢复该队列。而 `deliveryMode` 是针对消息的，`autoDelete` 用于在最后一个消费者断开后删除队列，`txSelect` 用于开启事务。",
    "source": "文档中「1. 持久化队列」部分",
    "hint": "思考一下声明队列时，哪个参数决定了它的“耐用性”或“持久性”。"
  },
  {
    "question": "当生产者需要发布一条能抵御服务器崩溃风险的持久化消息时，最关键的设置是什么？",
    "options": [
      "使用 channel.exchangeDeclare 方法并设置 durable 为 true",
      "在调用 basicPublish 时，将 MessageProperties 的 deliveryMode 设置为 2",
      "将消费者的 autoAck 参数设置为 false",
      "在调用 queueDeclare 方法时，将 exclusive 设置为 true"
    ],
    "correctAnswerIndex": 1,
    "explanation": "消息的持久化是通过设置其属性来实现的。具体来说，需要在发布消息时，将 `AMQP.BasicProperties` 的 `deliveryMode` 属性设置为 `2`。这会指示RabbitMQ将此消息保存到磁盘。仅持久化队列或交换机并不能保证消息本身的持久化。",
    "source": "文档中「2. 持久化消息」部分",
    "hint": "文档中提到了一个特定的数字属性值，用于表示消息的持久化模式。"
  },
  {
    "question": "根据文档描述，将一个交换机（Exchange）声明为持久化（durable=true）的主要作用是什么？",
    "options": [
      "确保交换机在服务器重启后仍然存在",
      "自动将所有路由到该交换机的消息都标记为持久化",
      "强制所有绑定到该交换机的队列也必须是持久化的",
      "提高消息通过该交换机的路由性能"
    ],
    "correctAnswerIndex": 0,
    "explanation": "文档明确指出：“交换机的持久化本身不会影响消息的持久化。交换机的持久化确保交换机在服务器重启后仍然存在。” 这意味着它的作用是保存交换机自身的定义和绑定关系，而不是改变流经它的消息的属性。",
    "source": "文档中「3. 持久化交换机」部分",
    "hint": "文档中特意区分了交换机持久化和消息持久化的作用，前者是为了什么结构本身的存在？"
  },
  {
    "question": "在消费者端，为了防止消息在处理过程中因消费者程序异常退出而丢失，应该采用哪种机制？",
    "options": [
      "生产者事务机制（txCommit / txRollback）",
      "发布消息时设置 mandatory 标志",
      "手动消息确认（Manual Acknowledgment）",
      "声明一个排他队列（exclusive=true）"
    ],
    "correctAnswerIndex": 2,
    "explanation": "手动消息确认机制要求消费者在成功处理完一条消息后，显式地调用 `channel.basicAck` 来告知RabbitMQ。如果消费者在发送确认前崩溃，RabbitMQ会认为该消息未被成功处理，并将其重新投递给其他消费者，从而保证了消息不会丢失。",
    "source": "文档中「4. 事务与确认机制」中的「消息确认（Acknowledgment）」部分",
    "hint": "当消费者处理完任务后，它需要向RabbitMQ发送一个“回执”来表示任务完成，这是什么机制？"
  },
  {
    "question": "为了最大程度地确保一条消息从生产者发出到被消费者安全处理的整个过程中不因服务器重启而丢失，以下哪项描述了最完整的配置组合？",
    "options": [
      "只需将队列声明为持久化",
      "只需将消息发布为持久化模式",
      "交换机、队列都声明为持久化，并且消息以持久化模式发布",
      "只需在生产者和消费者两端都使用事务"
    ],
    "correctAnswerIndex": 2,
    "explanation": "要实现端到端的持久化保障，需要一个完整的链条。这包括：1. 交换机本身是持久的，以防重启后路由规则丢失；2. 队列是持久的，以防存储消息的容器丢失；3. 消息本身是持久的，确保它被写入磁盘。这三者缺一不可。",
    "source": "文档中「总结」部分",
    "hint": "思考一下消息传递的整个路径：生产者 -> 交换机 -> 队列。要确保万无一失，路径上的哪些关键组件需要持久化保障？"
  },
  {
    "question": "在RabbitMQ的事务模式下，`channel.txCommit()` 命令的核心作用是什么？",
    "options": [
      "回滚当前事务，丢弃所有已发布但未提交的消息",
      "开启一个新的事务通道，准备发布消息",
      "原子性地提交当前事务，使得事务内的所有操作生效",
      "确认单条消息已经被消费者成功处理"
    ],
    "correctAnswerIndex": 2,
    "explanation": "`txCommit()` 用于提交一个已经通过 `txSelect()` 开启的事务。它会将该事务期间所有发布的消息作为一个原子单元进行提交。如果提交成功，消息将被可靠地发送到目标队列；如果期间发生错误，可以调用 `txRollback` 来回滚所有操作。",
    "source": "文档中「4. 事务与确认机制」中的「事务」部分",
    "hint": "在数据库操作中，“Commit”一词通常意味着什么？RabbitMQ中的事务概念与之类似。"
  },
  {
    "question": "如果在消费者处理消息时发生异常，但我们希望该消息能被重新投递给其他消费者尝试处理，应该调用哪个方法？",
    "options": [
      "channel.basicAck(deliveryTag, false)",
      "channel.txCommit()",
      "channel.basicNack(deliveryTag, false, true)",
      "channel.basicCancel(consumerTag)"
    ],
    "correctAnswerIndex": 2,
    "explanation": "`channel.basicNack` 用于拒绝一条或多条消息。它的第三个参数 `requeue` 如果设置为 `true`，则表示RabbitMQ应该将这条被拒绝的消息重新放回队列的头部（或尾部，取决于版本和配置），以便重新投递。这对于处理临时性失败非常有用。",
    "source": "文档中「4. 事务与确认机制」中的「消息确认（Acknowledgment）」部分",
    "hint": "文档中的代码示例展示了在 `catch` 异常块中如何拒绝消息并请求重新排队。"
  }
];
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        let score = 0;
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          optionsListEl.innerHTML = '';
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                // 如果选错了，高亮错误选项
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            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

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        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  